I would update your server and have a read through this.
In your port forward settings only use TCP not UDP
| Topic | Replies | Views | Activity | |
|---|---|---|---|---|
| Sicherheitswarnung Internetanbieter | 3 | 435 | June 1, 2020 | |
| PLEX stopped being detected on TV | 1 | 66 | May 19, 2021 | |
| REPORT! SlyPlex | 49 | 138 | January 7, 2020 | |
| The thread detection in my firewall is reporting increase in potential threat on my public Plex port | 9 | 175 | April 5, 2022 | |
| Plex opens random UDP port numbers that change with each restart, and I see UFW packet denies | 14 | 128 | August 27, 2023 |